Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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IG ſupra grauitatem P, patet quod vt ſuperetur im
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pedimentum, quod reperit lignum FE ipſumque
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a-ſcẽdere
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ſcendere</
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vetat ſufficiet vis ponderis Q, quæ eſt diffe
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rentia ponderis aquæ prementis IG, & leuitatis li
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gni FE. </
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<
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id
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">Sed hoc eſt falſum, quandoquidem pręter
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pondus Q requiritur etiam pondus R æquale pon
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deri abſoluto cylindri lignei FE, & inſuper requiri
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tur pondus P quod vnà cum Q æquantur ponderi a
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quæ IG. </
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<
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id
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">Quapropter adeò falſum eſt ligneum cylin
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drum FE virtute propriæ leuitatis vim ſursùm exer
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cere in aqua, vt potiùs deorsùm premat, vt corpus
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graue. </
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Ibidem.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
s
id
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">Et hactenùs comparauimus vires comprimentes
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grauitatis ſuperincumbentis cylindri aquei IG & le
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uitatis cylindri lignei FE, reſtat modò vt paritèr
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abbr
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cõ-paremus
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paremus</
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velocitates prædictorum corporum, ſcilicèt
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videndum qua velocitate lignum FE ſursùm à vile
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uitatis impellatur reſpectu contrariæ celeritatis, qua
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aqua ABD per infimum foramen BC effluit: eo pro
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pemodum modo, quo piſces contra curſum alicuius
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fluentis fluminis mouentur, ſi enim piſcis velociùs
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natat, quàm aqua contrario curſu currat, procùl du
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bio piſcis reſpectu fundi, & ripæ, & ſpatij mundani
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contra a quæ curſum reuera excurret aliquantiſper,
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quòd ſi prædictæ duæ contrariæ velocitates æquales
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fuerint, licèt reuera piſcis agitetur, commoueatur
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que ſemper in eodem ſitu mundani ſpatij perſiſtet, ſi
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tandèm velocitas piſcis minor fuerit celeritate con
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traria fluentis, licèt piſcis natet, & verè anterius ex-</
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